Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
A: histidine is found in all parts of the plant – roots, stem, leaves, and flowers
B: the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C: others of the closely related group of plants are also found to produce histidine in large quantities
D: cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E: the concentration of histidine in the growing herb declines as the plant approaches maturity
C
希望NN能帮帮忙，这个和others of the closely related group of palnts 有什么关系呀？题干中的逻辑链条我实在理不清楚。还有a hypothesis that would gain support if ，这句话到底是什么意思啊，这个是对什么的hypothesis，从哪里gain support，有什么表现呀？
先谢谢了
答案选C。注意本题最终让你加强的结论是the herb’s high histidine（不是别的物质） production is what allows it to grow in metal-rich soils（不是别的功能）。混淆选项为A和D，但这两个选项其实都不能加强原文结论。C选项成立的原因是根据A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants.即这一个group的植物都可以在该土质下生存，而原文只说了a ceratin herb，而C选项就是把这个group的其他植物也都说了，因此有力证实了原结论。
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